Rotary motion transmitting mechanism



Aug. 11, 1959 A. c. RIPKE ROTARY MOTION TRANSMITTING MECHANISM Filed Dec. 3, 1956 IN V EN TOR.

AUGUST C. RIPKE Z,88,76 Patented Aug. 11, 1959 ice ROTARY MOTION TRANSMETTING MECHANISM August C. Ripke, Austin, Minn.

Application December 3, 1956, Serial No. 625,882

6 Claims. (Cl. 7486) This present invention relates to new and useful improvements in rotary motion transmitting mechanism and concerns especially the actuating of a sweep arm by an eccentrically driven member.

An object of the invention is to provide a mechanism for translating the rotation of a crank shaft into the propelling of a radial sweep iarm whose inner end rotates on an axis concentric with said shaft.

A further object of the invention is to provide a mechanism for transmitting rotary motion from a shaft to a sweep arm whose axis is concentric therewith through a crank driven disk on said shaft, a ring eccentrically actuated by said disk and a novel roller-mounted carriage on the outer end of the sweep arm engaged by the ring.

A further object of the invention is to provide a multiple roller carriage for a sweep arm having a yoke-evener mechanism for holding the rollers under balanced spring tension in operative contact with a driving member.

To the accomplishment of these and related objects as shall become apparent as the description proceeds, the invention resides in the construction, combination and arrangement of parts as shall be hereinafter more fully described illustrated in the accompanying drawings, and pointed out in the claims hereunto appended.

The invention will be best understood and can be more clearly described when reference is had to the drawings forming a part of this disclosure wherein like characters indicate like parts throughout the several views.

In the drawings:

Figure 1 is a vertical section of a possible embodiment of the invention;

Figure 2 is a plan view thereof;

Figure 3 is an enlarged sectional plan of the sweep arms multiple roller carriage; and

Figure 4 is an exploded type detail plan of the carriage equalizer and the two-part bracket of the intermediate roller.

Applicable to a wide range of uses, the mechanism consists broadly in a novel sweep arm structure and the propulsion thereof by an eccentrically driven member, the latter being illustrated herein by a loosely supported ring actuated by a rotating crank-carried disk. For convenience of description, the simple embodiment of the invention disclosed herein is shown as operating on a horizontal plane about a vertical axis.

On a suitable base 1, an annular shell or wall-like frame 2 is set that at a level below its top 3 is provided with an outwardly extending horizontal shelf 4 that serves as a supporting platform. A buffer band 5 rests on the shelf 4 and snugly embraces the periphery of the portion of the shell or frame 2 that rises above the shelf. A loose ring or hoop 6 is movably supported on the shelf, being angular in cross-sectional form, as seen clearly in Figure 1;'its horizontal base arm lying on the shelf and its upstanding arm n'sing well above the top 3 of the frame wall 2, being on its inner side, next the buffer band 5. The inner circumference of the hoop 6 has a diameter substantially greater than the external diameter of the buffer band 5 yet less than the external diameter of the shelf 4, and being designed to move freely on the shelf within the limits of the play allowed, it is preferably suitably supported as on a film of oil or graphite or ball or other bearings.

Concentrically within the annular frame 2 a vertical shaft 7 is joumalled in a base block 8 and driven by the shaft 9 from any desired source of power through meshing bevel gears 10 and 11 on the drive and vertical shafts 9 and 7 respectively. A crank 12 is formed on the upper end of the shaft 7 that rotatably carries a large disk 14 of approximately as great diameter as the frame 2 and at a level just above the top 3 of the frame wall so that as the crank shaft is rotated by the drive shaft 9, the portion of the disks circumference most offset by the crank projects substantially beyond the periphery of the frame Wall 2 and bears against the inner side of the upstanding arm of the loose ring 6 freely movable eccentrically on the frame shelf 4.

In counter thrust against the outer side of the ring 6 is a sweep arm 15, with a tension-equalizing multiple roller carriage 16 on its outer end in rolling contact with the ring, and rotatably journalled at its inner end by a sleeve 17 on the shaft 7. The sweep arm sleeve 17 may be provided with a bevel gear 18 meshing with a companion pinion 19 on the take-off or driven shaft 20 if desired, the unitary sleeve and gear 17-18 being supported on the shaft 7 by a flange bearing 21. Thus it will be seen that as the crank carried disk 14 is rotated, it actuates the ring 6 eccentrically and this in turn impels the sweep arm 15 as its roller carriage rides ahead of the outwardly urged eccentric movement of the ring.

The sweep arm carriage 16 on the outer free end of the arm includes a cross yoke 24 that is pivoted on the sweep arm with one reach considerably longer than the other, such longer reach having an angle arm 25 with a roller 26 rotatably mounted on the free end thereof. The shorter reach of the yoke has a shorter angle arm 27 on which an evener 28 is centrally pivoted with angle shaped roller brackets 29 and 30 pivoted on opposite ends thereof by their respective stems. The bracket 29 on the end of the evener 2% remote from the roller 26 has a roller 31 on the free end of its angle arm that is directed toward the first mentioned roller 26. The other even-carried jacket 30 has a much shorter angle arm than bracket 29 but it also extends toward the roller 26 and likewise carries a roller 32 on its free end. This shorter angle arm bracket 30 has its stem formed in two pieces 30a and 3% connected by engaging segmental gear ends, with each of the stem pieces being pivoted on the evener which at this end has a rearward extension or wing 28a. A tension spring 33 is stretched between the free ends of the stem of bracket 29 and of the second piece 30b of the stem of bracket 30 whereby all three rollers 31, 32 and 26 are caused to bear against the ring 6 under a spring tension subject to equalizing by this specific teetering yoke and evener assembly. It will be noted that the roller 31, which may be considered as the rearmost one lies in line with the pivotal connection of the yoke on the outer end of the sweep arm.

From the foregoing description taken in connection with the accompanying drawings, it will be manifest that a Rotary Motion Transmitting Mechanism is provided that will fulfill all the necessary requirements of such a device, but as many changes could be made in the above description and many apparently widely different embodiments of the invention may be constructed within the scope of the appended claims, without departing from the spirit or scope thereof, it is intended that all matters contained in the said accompanying specification and drawings shall be interpreted as illustrative and not in a limitative or restrictive sense.

Having thus described the invention, what is claimed l. A transmitting mechanism comprising in combination a crank shaft; a disk rotatably mounted on the crank thereof; a supporting frame concentric with said shaft ofgreater diameter than said disk; a loose ring supported by said frame and engageable by said disk to be oscillated in an eccentric orbit thereby; and a sweep arm, adapted to be impelled by said eccentric orbit oscillated ring, rotatably mounted at its inner end on said shaft and having its outer end in rolling engagement with the periphcry of said ring at substantially the point thereof nearest the axis of said shaft.

2. The structure defined in claim 1 wherein said frame has a horizontal shelf extending outwardly therefrom that serves as a supporting platform for said loose ring, said ringhaving an interior diameter substantially greater than the exterior diameter of said frame but less than the outer diameter of said shelf whereby the ring may move freely in an eccentric manner on said frame shelf when actuated by said disk.

3. The structure as defined in claim 2 wherein the ring is of angular form in cross section having the horizontal arm of the angle resting on said frame shelf and the vertical arm on the inner side of the ring next to the frame and of a height to rise above the top of said frame and to be engaged by said disk at a level above the top of said frame.

4. Forthe mechanism defined in claim 1, a multiple roller carriage for the outer end of said sweep arm comprising a yoke pivoted on the sweep arm, a roller on one end of said yoke, an evener pivoted intermediate its ends on the opposite end of said yoke, an angle bracket pivoted on each end of said evener, a roller in one end of each bracket and a tension spring extended between the 0pposite ends of said brackets, whereby the three rollers are caused to engage the outer side of said ring in rolling contact under equalized spring tension.

5. A multiple roller carriage of the character described comprising in combination with a sweep arm rotatably mounted at its inner end; a yoke pivoted on the outer end of the-sweep arm having an inwardly extending angle arm at each end, a roller on the end of the angle arm at one end of said yoke and an evener pivoted approximately midway of its length on the angle arm at the other end of said yoke, the roller carrying angle arm being longer than the evener carrying angle arm and the reach of the yoke on the roller end being substantially the greater; an angle bracket pivoted on each end of saidevener by its stem and each having an arm at substantially right angles thereto with a roller on its free end; and a tension spring acting on said angle brackets to cause an equalizing of pressure on all three rollers of the sweep arm carriage.

6-. In combination with the roller carriage structure defined in claim 5, one of, said angle brackets having its stem formed in two sections each pivotally carried by said evener and being connected by engaging segmental.

gear ends, the roller carrying ends of both brackets extending in the same direction. and the spring being extended between the free ends of the stems of the one. piece and two piece brackets respectively.

References Cited in the file of this patent UNITED STATES PATENTS Rockford Dec. 26, 1916 Ripke Dec. 4, 1956 

